package main
// import "fmt"
// import "unsafe"
import(
	"fmt"
)

func main(){
var n1 int = 10
var n2 int = 20

var sum int = 0
sum += n1
sum += n2

fmt.Println(sum)
var n3 int = 30
var n4 int = 40

var sum1 int = 0
sum1 += n3
sum1 += n4

	fmt.Println(sum1)
}
